Commutator brush



Sept. 2, 1924. 1,506,734

W. 5. CLICK COMMUTATOR BRUSH Filed Oct. 29. 1920 INVENTOR Mww mm:

ATTORNEY were employed for this purpose, great care Patented Sept. 2, 1924.

UNITED STATES PATENT OFFICE.

WILLIAM S. CLICK, OF TURTLE GREEK, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

COMMUTATOR BRUSH.

Application filed October 29, 1920. Serial No. 2tl,537.

To all whom it may concern:

Be it known that 1, WILLIAM S. CLICK, a citizen of the United States, and a resident of Turtle Creek, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Commutator Brushes, of which the follow ing is a specification.

My invention relates to commutator brushes and it has particular relation to conductor or shunt attachments therefor.

One of the objects of my invention is to provide means whereby a conductor may be quickly and easily secured to a carbon commutator brush without necessarily en ploying solder, screws, amalgam or the like.

Another object is to provide a method of attaching a conductor to a brush that will insure proper electrical contact therebetween under all normal conditions.

Briefly stated, my invention consists in brush-engaging extremity of the conductor is preferably bent or fiolded upon itseli to form an enlargement which is forced into the relatively large portion of the tapered aperture. The folded end of the conductor may be wired or otherwise suitably secured together in its folded position to prevent the same from being pulled out of the aperture. The tolded end of the conductor is forced into the aperture with suflicient pressure to maintain the same against displacement, under normal conditions, but additional securing means, such as transverse tubular rivets, may be utilized, if desired.

Heretofore, in devices of this general character, it has been customary to employ various fastening means for this purpose, such as solid rivets, screws, bolts, solder, amalgam and the like, some of which materially added to the cost of manufacture. lit has been observed that, when solid rivets was necessary in upsetting or riveting the ends thereof to avoid fracturing or breaking the fragile carbon brush, and that solder, when utilized, melted when the brush, from any cause, became excessively heated.

ltt has been further observed that certain forms of amalgam, when employed as a fastening means, lost its electrical conducthe conductor in position.

- tivity upon a rise in temperature. When such a condition arose, all of the current passed directly to the brush-box and resulted in pitting both the brush and the box and shortened the life of each.

By my invention, I provide a method of attaching a conductor to a carbon brush by frictional engagement with a conical aperture, thereby avoiding the employment of expensive additional fastening means.

In the accompanying drawings:

F igure 1 is a view, partially in elevation and partiallyin vertical longitudinal section, of a commutator brush having a conductor secured thereto in accordance with my invention."

Fig. 2 is a view similar to Fig. 1, showmg a method of securing the folded end of Fig. 3 is a view similar to Figs. 1 and 2 and illustrating a method of securing a con ductor within an aperture by means of tubular rivets.

Fig. 4 is a side elevational view of the structure illustrated in Fig. 8.

Fig. 5 is a vertical transverse sectional view on line V-V of Fig. l.

Referring to the drawings, 1 indicates a commutator brush of any preferred composition or material. A substantially diagonally disposed tapered or conical aperture 2 is drilled, molded, or otherwise suitably formed in the brush adjacent to the upper portion thereof. The upper and relatively small extremity of the aperture 2 terminates in a diagonal face 3 adjacent to one edge of the brush 1.

A conductor'or shunt at, is formed with one extremity thereoi bent or folded upon itself, as indicated at 5, and is forced into the tapered aperture 2. The diameter of the larger portion of the aperture 2 is 'su'fficient to permit the folded portion of the conductor to enter the same but the diameter of the smaller portion of the aperture being substantially that of the conductor. will not permit the folded portion 5 of the conductor to be withdrawn entirely therethrough.

By this construction, the folded portion of theconductor may be tightly jammed or wedged within the tapered aperture The folded portion 5 of the conductor may be wired or otherwise suitably secured to gether, as indicated at 6, to overcome any tendency of the conductor to pull out.

While, under normal conditions, the frictional engagement of the folded portion of the conductor with the Walls of the aperture 2 is suflicient to maintain the same against displacement, additional securing means may be employed, if desired. For this purpose, the brush 1 may be provided with a plurality of transverse apertures 7, (Fig.

having countersunk extremities 8, and arranged to intersect the conical aperture 2. Tubular rivets 9 are forced into the aperture 7 and between the strands of the folded portions 5 of the conductor. The extre1nities of the rivets 9 are so spread, by any suitable tool, as to enter the countersunk portions 8 and to lie flush with the surface of the brush.

By my invention, provide a quick and inexpensive means of attaching a conductor to a commutator brush that will avoid the disadvantages heretofore encountered and that Will insure a proper electrical contact between the brush and the conductor, under a high degree of temperature.

It claim as my invention:

1. A, commutator brush ture therein, a conductor having oneend thereof folded upon itself disposed entirely in said a )erture, and means extending through said folded end to maintain said conductor in said aperture.

2. A commutator brush having a conical aperture therein and a conductor having one end thereof folded upon itself and disposed within said aperture, and a tubular fastening member extending transversely through said folded end to maintain said conductor in said aperture.

3. A commutator brush having aperture therein, a conductor having one end thereof folded upon itself and disposed entirely Within said aperture, means Wound around said folded end to maintain the same position, and a fastening member extendtransversely through said brush and ued portion of said conductor to maintain conductor Within said aperture.

commutator brush having a conical aperture extending diagonally theretliroi'igh, a c nluctor having one end thereof folded upon itself and disposed entirely Within said f"3i;t1;', means indep ndent of said aperfor iring the fo led end of said conlded position a fastening 3 nding transversely through said hi nductor to maintain the conductor against displacement.

5. A commutator brush having a plurality intersecting apertures, a conductor having one end thereof olded upon itself disposed entirely Within one of said apertures, and a tubular fastening member disposed within another of said apertures having an aperture therein and a conductor having one end thereof folded upon itself and disposed Within said aperture, and a fastening member extending transversely through said folded end to maintain said conductor in said aperture.

8. A comn'iutator brush having an aperture therein and a conductor having one end thereof folded upon itself and disposed within said aperture, and atubular fastening member extending through said folded end to maintain said conductor in said aperture.

9. A commutator brush having an aperture therein, a conductor having one end thereof folded upon itself and disposed entirely within said aperture, means Wound around said folded end to maintain the same in position, and a fastening member extending through said brush and folded portion of said conductor to maintain said conductor within said aperture.

10. A commutator brush having a conical aperture extending therethrough, a conductor having one end thereof folded upon itself and disposed entirely Within said aperture, means independent of said aperture for securing the folded end of said conductor in folded position and a fastening member extending through said brush and conductor to maintain the conductor against displace ment.

A commutator brush having a conical aperture extending theretlu'migh, a conducfor having one thereof folded upon itself and disposed entirely within said ture, means dependent of tor folded position and a fastening oer extend transversely throug s orush and co curt or to maintain the couducagainst dis a co;

rlcd upon nnin one of said ling member d aperoscd tending throu, the olded portion of said conductor for interlocking engagement therewith.

tes y whereof, 4; Wave hereunto subscribe name this th day of Uctw oer, 

